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... was equal the drop for the adopted whites (10.1). The drop was smaller for the adopted blacks specifically (7.7), which could be due to the decline with age in the effect of "pre-adoption variables". According to the Wikipedia article, Loehlin suggested prenatal effects, noting ...

I'm not sure it would be some slow decline. Because that would mean that some are compatible and some are not, while they all must be compatible to each other (more less) Thank you for your comment - Like the timescale, the rate of decline ...

... or 100K years and try again (the actual time is arbitrary for the question). It seems that at some point, reproductive compatibility would begin a decline. At X years back, you see only 99% compatibility. At X+100K years back, maybe you see 50% compatibility. The question is, does it follow that ...